Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 118, Issue 11, Pages 5805-5813Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JB010519
Keywords
pressure sensors; diamond anvil cells; elastic moduli; elasticity: rocks and minerals
Categories
Funding
- ERC [227893]
- EC
- National Science Foundation - Earth Sciences [EAR-1128799]
- Department of Energy - Geosciences [DE-FG02-94ER14466]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- HASYLAB/DESY [I-20110507]
- European Research Council (ERC) [227893] Funding Source: European Research Council (ERC)
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Primary pressure determinations involve the measurement of pressure without recourse to secondary standard materials. These measurements are essential for ensuring the accuracy of pressures measured in gasketed high-pressure devices. In this study, the wavelength of optical fluorescence bands and the density of single crystal Sm-doped yttrium aluminum garnet Y3Al5O12 (Sm:YAG) have been calibrated as a primary pressure scale up to 58GPa. Absolute pressures were obtained by integrating the bulk modulus determined via Brillouin spectroscopy with respect to volumes measured simultaneously by X-ray diffraction. A third-order Birch-Murnaghan equation of state of Sm:YAG yields V-0=1735.15(26)angstrom(3), K-T0=185(1.5)GPa, and K`=4.18(5). The accompanied pressure-induced shifts of the fluorescence lines Y1 and Y2 of Sm:YAG were calibrated to the primary pressure, thus creating a highly accurate fluorescence pressure scale. These shifts are described as P=(A/B)*{[1+(/(0))](B)-1} with A=2089.91(23.04), B=-4.43(1.07) for Y1, and A=2578.22(48.70), B=-15.38(1.62) for Y2 bands, here =-(0), and (0) are wavelengths in nanometer at pressure and ambient conditions. The sensitivity in the pressure determination of the Sm:YAG fluorescence shift is 0.32nm/GPa, which is identical to that of the ruby scale. Sm:YAG can be considered elastically isotropic up to 58GPa, implying insensitivity of the determined pressure to the crystallographic orientation under nonhydrostatic or quasi-hydrostatic conditions. The Sm:YAG fluorescence shift is apparently also independent of crystallographic orientation, in contrast to that of ruby. Since the Y fluorescence band of Sm:YAG is insensitive to temperature changes, this material is highly suitable for the measurement of pressure at elevated temperatures.
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